4.2 Review

Gastrointestinal Dysfunction in Parkinson's Disease: Neuro-Gastroenterology Perspectives on a Multifaceted Problem

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Epidemiology and Healthcare Utilization in Patients With Gastroparesis: A Systematic Review

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Summary: This study systematically reviewed the epidemiology of gastroparesis (GP), including prevalence, incidence, etiologies, and hospitalizations. Thirteen studies were included, which showed varying rates of GP in different countries and years. Females and patients with diabetes were more susceptible to GP. Rates of hospitalizations and emergency department visits for GP are increasing, and mortality rates for GP patients are higher compared with the general population.

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R. L. H. Yim et al.

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Review Gastroenterology & Hepatology

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Small Intestinal Bacterial Overgrowth-Pathophysiology and Its Implications for Definition and Management

Daniel Bushyhead et al.

Summary: The concept of small intestinal bacterial overgrowth (SIBO) explains the cause of maldigestion and malabsorption. With the development of diagnostic testing, the methods for diagnosing SIBO have evolved from small bowel culture to breath tests and culture-independent microbial analytics. The availability of breath tests has led to an expansion in the diagnosis of SIBO and the associated clinical symptoms. However, issues with the specificity of breath tests have raised doubts about the role of SIBO in certain clinical scenarios. The hope is to use modern molecular microbiology to study the human small intestinal microbiome in order to provide an objective basis for diagnosing SIBO.

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Giuseppe Cosentino et al.

Summary: Parkinson's disease is a neurodegenerative disorder characterized by motor and non-motor dysfunction, with dysphagia being a common yet often underdiagnosed symptom. A multinational group of experts conducted a systematic review and consensus conference to provide guidance on the screening, diagnosis, and impact of dysphagia on the prognosis and quality of life of PD patients. The consensus statements offer a framework for timely detection and accurate diagnosis of dysphagia in PD.

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Epidemiological trends of gastrointestinal and liver diseases in Malaysia: A single-center observational study

Sze Zee Lim et al.

Summary: This study retrospectively analyzed outpatient data from a specialist clinic and found that there are differences in the prevalence of gastrointestinal and liver diseases among different ethnic groups. Indian patients were more likely to be diagnosed with inflammatory bowel disease, while Malay and Indian patients had a higher prevalence of non-alcoholic fatty liver disease (NAFLD).

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Effectiveness of an herbaceous derivatives, PHGG, plus sodium hyaluronate in the treatment of chronic constipation in patients with Parkinson's disease: a pilot study

Laura Vacca et al.

Summary: The study investigated the efficacy and safety of PHGG plus hyaluronate (PHGG+) in PD patients suffering from constipation, showing minimal yet significant improvement in symptoms. PHGG+ was found to be safe and well tolerated, with data suggesting its efficacy in alleviating constipation in PD patients.

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Gastrointestinal Dysfunction Impact on Life Quality in a Cohort of Russian Patients with Parkinson's Disease I-III H&Y Stage

A. A. Pilipovich et al.

Summary: The study aims to assess the impact of gastrointestinal dysfunction and its symptoms on the quality of life of Parkinson's disease patients. The results show that depression and gastrointestinal dysfunction have a significant negative influence on the patients' quality of life, especially constipation and abdominal pain.

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Probiotics synergized with conventional regimen in managing Parkinson's disease

Hairong Sun et al.

Summary: The study found that co-administration of the probiotic Probio-M8 can improve sleep quality, alleviate anxiety, and gastrointestinal symptoms in patients with Parkinson's disease. It also has an impact on the host's gut microbiome, gut microbial metabolic potential, and serum metabolites.

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Article Gastroenterology & Hepatology

ACG Clinical Guideline: Gastroparesis

Michael Camilleri et al.

Summary: The guidelines summarize the diagnosis and management of gastroparesis in adults, representing the official practice recommendations of the American College of Gastroenterology.

AMERICAN JOURNAL OF GASTROENTEROLOGY (2022)

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British Society of Gastroenterology guidelines on the management of functional dyspepsia

Christopher J. Black et al.

Summary: This research aims to review and summarize the current evidence on functional dyspepsia, provide a practical framework for evidence-based diagnosis and treatment of patients, and provide specific recommendations based on the GRADE system. The study also considers the development of novel treatment methods and highlights areas of unmet need and priorities for future research.
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Gastrointestinal Motility and Response to Levodopa in Parkinson's Disease: A Proof-of-Concept Study

Delaram Safarpour et al.

Summary: This study aimed to investigate whether altered segmental gastrointestinal transit time (GITT) correlates with clinical response and plasma levodopa concentration (PLC) variability in patients with Parkinson's disease. The results showed no significant difference in GITT between typical and erratic responders. Additionally, Small Intestinal Bacterial Overgrowth (SIBO) was positive in half of the erratic responders and negative in most typical responders.

MOVEMENT DISORDERS (2022)

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The microbiome-gut-brain axis in Parkinson disease - from basic research to the clinic

Ai Huey Tan et al.

Summary: The close bidirectional link between the brain and the gut in Parkinson disease has led to a paradigm shift in neurology. Gut-related factors play significant roles in the development, progression, and treatment responses of Parkinson disease, and could potentially be targeted for therapeutics. The gut microbiome, in particular, has been highlighted as an important factor. Future directions for the field include further understanding of the gut-brain axis and addressing current knowledge gaps and challenges.

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Management of dysphagia and gastroparesis in Parkinson's disease in real-world clinical practice - Balancing pharmacological and non-pharmacological approaches

Roongroj Bhidayasiri et al.

Summary: Patients with Parkinson's disease commonly experience gastrointestinal issues, including constipation and upper GI issues like dysphagia and gastroparesis, which are often overlooked. Timely and effective management of upper GI issues is crucial for improving the quality of life and medication effectiveness in PD patients.

FRONTIERS IN AGING NEUROSCIENCE (2022)

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Association Between Microbial Tyrosine Decarboxylase Gene and Levodopa Responsiveness in Patients With Parkinson Disease

Yi Zhang et al.

Summary: The abundance of microbial tyrDC gene may serve as a potential biomarker for levodopa responsiveness in Parkinson's disease. Predicting levodopa responsiveness based on tyrDC gene abundance showed good calibration and discrimination in both cross-validation and external validation. Novel strategies targeting the tyrDC gene could provide new approaches for personalized levodopa treatment.

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Probiotics for constipation and gut microbiota in Parkinson's disease

Yitong Du et al.

Summary: This study suggests that probiotic treatment can effectively improve constipation symptoms in Parkinson's disease patients and have a positive impact on the gut microbiota.

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The prevalence and associated factors of dysphagia in Parkinson's disease: A systematic review and meta-analysis

Siyuan Gong et al.

Summary: This systematic review and meta-analysis evaluates the prevalence of dysphagia in Parkinson's disease (PD) and its associated factors. The findings indicate that dysphagia occurs in more than one-third of PD patients, with instrumental examination showing a higher prevalence. The prevalence of dysphagia varies across different regions, with Oceania having the highest prevalence and America having the lowest. Dysphagia in PD is associated with several demographic characteristics, PD-related characteristics, motor symptoms, non-motor symptoms, as well as decreased quality of life.

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Asian-Pacific consensus on small intestinal bacterial overgrowth in gastrointestinal disorders: An initiative of the Indian Neurogastroenterology and Motility Association

Uday C. Ghoshal et al.

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Ami D. Sperber et al.

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Epidemiology and outcomes of gastroparesis, as documented in general practice records, in the United Kingdom

Yizhou Ye et al.

Summary: Through analysis of the CPRD database, it was found that the standardized prevalence of gastroparesis in 2016 was 13.8 per 100,000 persons, while the standardized incidence increased from 1.5 per 100,000 person-years in 2004 to 1.9 in 2016. Diabetic gastroparesis and idiopathic gastroparesis were the most common disease etiologies, with diabetic gastroparesis patients having a significantly higher risk of mortality after diagnosis compared to idiopathic gastroparesis patients.
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Systematic review and network meta-analysis: efficacy of drugs for functional dyspepsia

Alexander C. Ford et al.

Summary: Through a systematic review and network meta-analysis, we found that tricyclic antidepressants (TCAs) are effective treatments for FD, and sulpiride or levosulpiride also show high efficacy. However, TCAs are more likely to cause adverse events.

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A Pragmatic Approach to the Perioperative Management of Parkinson's Disease

Abhishek Lenka et al.

Summary: This review comprehensively discusses the challenges in perioperative management of PD patients, including medication reconciliation, administration of dopaminergic medications, choice of anesthesia, respiratory issues, dysautonomia, and emphasizes the importance of multidisciplinary teamwork in preventing and managing perioperative complications.

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Gut Microbial Ecosystem in Parkinson Disease: New Clinicobiological Insights from Multi-Omics

Ai Huey Tan et al.

Summary: The study found significant differences in gut microbiome and metabolome between Parkinson's disease (PD) patients and healthy controls, including changes in bioactive molecules and other compounds. Cognitive impairment, low BMI, and other factors in PD patients were associated with fecal metabolome composition differences.

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The epidemiology and quality of life of functional gastrointestinal disorders according to Rome III vs Rome IV criteria: A cross-sectional study in primary care

Kee-Huat Chuah et al.

Summary: The Rome IV criteria led to a decrease in the frequency of IBS and an increase in functional diarrhea compared to the Rome III criteria, while the frequency of FD and FC remained unchanged. Regardless of criteria, FGIDs significantly impacted healthcare burden and HRQOL.

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Digital Rectal Examination Is a Valuable Bedside Tool for Detecting Dyssynergic Defecation: A Diagnostic Study and a Meta-Analysis

Jie Liu et al.

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Evaluation of fecal microbiota transplantation in Parkinson's disease patients with constipation

Xiao-yi Kuai et al.

Summary: The study showed that fecal microbiota transplantation (FMT) is effective in improving gastrointestinal dysfunction in Parkinson's disease patients, significantly reducing both motor and non-motor symptoms, regulating the gut microbiota structure, restoring intestinal bacterial overgrowth, and improving constipation symptoms.

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Onset of Skin, Gut, and Genitourinary Prodromal Parkinson's Disease: A Study of 1.5 Million Veterans

Gregory D. Scott et al.

Summary: Through the study, it was found that gastrointestinal, genitourinary, and skin disorders appear decades before the diagnosis of Parkinson's disease, emphasizing their potential as early diagnostic testing and understanding pathogenesis. The estimated onset time is related to the association with certain diseases and diagnosis time, with constipation and urinary dysfunction having longer onset times.

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Arik Segal et al.

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Jolien Schol et al.

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NEUROGASTROENTEROLOGY AND MOTILITY (2021)

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Heithem Soliman et al.

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Ai Huey Tan et al.

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JOURNAL OF THE AMERICAN GERIATRICS SOCIETY (2015)

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Helicobacter pylori infection is associated with worse severity of Parkinson's disease

Ai Huey Tan et al.

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